Table 2.
Correlation between HRCT and surgical findings
| Feature | Perop. (n = 60) | On CT (n = 60) | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | |
|---|---|---|---|---|---|---|---|
| 1. | Soft tissue mass present | 58 (96.67%) | 52 (86.67%) | 89.65 | 100 | 100 | 25 |
| 2. | Aeration mastoid absent | 48 (80%) | 52 (86.67%) | 100 | 66.67 | 92.3 | 100 |
| 3. | Presence of Disease | 54 (90%) | 54 (90%) | 96.3 | 66.67 | 96.3 | 66.67 |
| 4. | Tegmen tympani eroded | 22 (36.67%) | 22 (36.67%) | 54.54 | 73.68 | 54.54 | 73.68 |
| 5. | Sinus plate eroded | 6 (10%) | 8 (13.33%) | 66.67 | 92.6 | 50 | 96.15 |
| 6. | Facial N. dehiscent | 20 (33.33%) | 10 (16.67%) | 40 | 95 | 80 | 76 |
| 7. | Lateral semi-circular canal fistula | 12 (20%) | 16 (26.67%) | 66.67 | 83.33 | 50 | 90.9 |
| 8. | Malleus erosion | 22 (36.67%) | 24 (40%) | 90.9 | 89.47 | 83.33 | 94.44 |
| 9. | Incus erosion | 46 (76.67%) | 34 (56.67%) | 65.21 | 71.42 | 88.23 | 38.46 |
| 10. | Stapes erosion | 30 (50%) | 34 (56.67%) | 40 | 26.67 | 35.29 | 30.76 |
| 11. | Disease outside middle ear | 12 (20%) | 10 (16.67%) | 83.33 | 100 | 100 | 96 |